feat: add markdown & mindmap viewer (#546)

* fix(snippets): initialize selectedSnippetIds with state snippetId

* feat(ui): active state in ActionButton

* feat(editor): add mindmap

* fix(editor): toggle off markdown functionality if lang non md

* feat(editor): watch selectedSnippetContent to trigger update mindmap

Author: antonreshetov

package.json

@@ -42,6 +42,7 @@
     "codemirror": "^5.65.18",
     "codemirror-textmate": "^1.1.0",
     "date-fns": "^4.1.0",
+    "dom-to-image": "^2.6.0",
     "electron-store": "^8.2.0",
     "elysia": "^1.2.15",
     "fs-extra": "^11.3.0",
@@ -51,6 +52,8 @@
     "ky": "^1.7.5",
     "lucide-vue-next": "^0.476.0",
     "marked": "^15.0.8",
+    "markmap-lib": "^0.18.11",
+    "markmap-view": "^0.18.10",
     "mermaid": "^11.6.0",
     "onigasm": "^2.2.5",
     "prettier": "^3.5.3",
@@ -69,6 +72,7 @@
     "@tailwindcss/vite": "^4.0.9",
     "@types/better-sqlite3": "^7.6.12",
     "@types/codemirror": "^5.60.15",
+    "@types/dom-to-image": "^2.6.7",
     "@types/fs-extra": "^11.0.4",
     "@types/node": "^22.10.8",
     "@types/sanitize-html": "^2.15.0",